Which type of ships are fast and have a variety of armaments but have little to no armor?

The correct answer is destroyers. These ships are designed for high speed and maneuverability, which allows them to engage in various naval operations effectively. They typically carry a diverse array of armaments, including surface-to-air missiles, anti-ship weapons, and sometimes even anti-submarine weapons, making them versatile in their combat capabilities.

Destroyers operate with the understanding that their speed and agility are key advantages; thus, they often sacrifice substantial armor to achieve this. The lack of significant armor is compensated by their ability to outmaneuver larger, more heavily armed vessels, as well as advanced technologies to detect and engage threats from distance.

In contrast, frigates also possess speed and weaponry but tend to be more oriented towards anti-submarine warfare and escort duties, which may include more protective features. Cruisers, by definition, are larger and usually have more heavy armament and armor. Submarines operate underwater and have a totally different role, focusing on stealth and sub-surface engagement rather than on surface speed and a variety of armaments.